Eat a Notch Apple.

Create an Iron Golem.

Brew a potion.

Build some bookshelves to improve your enchantment table.

Construct an Enchantment Table.

Throw diamonds at another player.

Use Shears to obtain wool from a sheep.

Acquire diamonds with your iron tools.

Wear a full suit of Iron armour.

Craft and place a Flower Pot.

Construct one type of each tool (one pickaxe, one spade, one axe and one hoe).

Harvest some leather.